Some of you might have caught my last post about my non-working Xwire unit. Are the transmitter/receiver combinations universal? I think this may be the case. I mean they aren't like the usual wireless that requires a transmitter and receiver on the same frequency. I assume that's why you can choose any of 5 channels on the transmitter. Reason I ask is that I've found an extra receiver and may be willing to give it a try to see if it will solve my problem.